Bloated tummy and constant burping in a 10 year old.

For the last week my 10 year old ds has been complaining that his stomach feels bloated, and has been burping lots and lots (he really can't help it, and is finding it distressing). He's eating ok, and going to the loo normally, but often says he feels sick.

Because it has been going on a while, and is very out of character for his normal health, I phoned the GP this morning, but they could only offer an emergency appointment (not an emergency) or not until 2nd week of April so I left it. I was hoping to pop him in for a quick chat one day after school/work, but that doesn't appear to be an option. Now I feel like a crap parent, and am wondering if it's something other parents would worry about, or if I'm being paranoid and should just leave it and see if it improves. Today I've bought some probiotics and some Gaviscon, as he may well just have indigestion, and we'll see if they help, but I suppose I'm asking if you think I should push for a sooner appointment?

Thank you. He did have a bout of diarrhoea about 10 days ago, and I'm wondering if this is just a left over tummy bug that's affecting his digestive system. I think I'll give it to the weekend with the Gaviscon and probiotics, and if there's no improvement I'll hassle for a GP appointment next week. It's hugely frustrating as he's ok - fine to go to school, but just uncomfortable, and it worries me (born worrier - not helpful!).